What is the actual meaning of busy time?

[dyllanwli]

I am running a high disk IO test on linux, using psutil to monitoring the linux disk usage. And I noticed that the busy time, which defined in document as " time spent doing actual I/Os (in milliseconds)", can be over 1000 milliseconds for each seconds.

Could someone please tell me what is the actual meaning of busy time?

here is my code:

while true:
    cpu = psutil.cpu_percent(interval=1)
    disk = psutil.disk_io_counters() 
    print(cpu)
    print(disk)

Are there anything I omitted so that cause the busy time over 1000 ms?

[dyllanwli]

Since there are several disks on my machine, if not use perdisk=True, the psutil will record all disk io information.